Not having to manage additional resources if they don't want to was also the core line of thought behind the proposed simplified system, that makes them generate small passive bonuses.
With say a 10% consumption every day, a logarithmic scale could grant a 0-5% production buff every day (that can go above pop cap) for materials, and a 0-3% morale+loyalty buff.
Useful to recover devastated regions, but otherwise, nobody suffers from not delving too much on them.
